http://render.otoy.com/forum/viewtopic.php?f=30&t=35459
I do not know whether you have read it already?
The path is used eg
D:\Textur\c4d
The texture is in fact under
D:\Textur\c4d\plant\baum\Textur-A
And under
D:\Textur\c4d\plant\Strauch\Textur-B
I put the path directly, just like you in your example, everything is alright.
But octane render must read but the subdirectories and memorize. You can not always adjust the paths...

opic.php?f=30&t=35459